Hewitt and Hallisay, both 34, have been dating for about 15 months. They initially met on the set of the short-lived NBC comedy "Love Bites." They later reconnected on Lifetime's "The Client List," in which Hallisay plays on-screen husband to Hewitt's double life-leading call girl.

Hallisay, who also appeared in the CW dramedy "Privileged," proposed to Hewitt in late May while the couple was vacationing in Europe, Us Weekly reports.